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BNC: 13995 COCA: 9822

cornerstone

noun

cor·​ner·​stone ˈkȯr-nər-ˌstōn How to pronounce cornerstone (audio)
1
: a stone forming a part of a corner or angle in a wall
specifically : such a stone laid at a formal ceremony
2
: a basic element : foundation
a cornerstone of foreign policy

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